Kinematic bones move all the mesh as if was mirrored
Your bone is called Bone.011 so it's not getting mirrored properly. You need to make sure the bones have names like hand.l, hand.r (for the other side) and so on.

For the automatic weighting, you can just redo it by reparenting the mesh to the armature with automatic weights.

Another thing that can break the automatic weights are incorrect normals, so you can go into edit mode, select all vertices and Recalculate Normals to make sure they are good.